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Re: Laptop battery charging circuit
A question.
If laptop battery BMS is locked (there is not output voltage), and you bridge, force, output voltage (I know, it is not recommended and it is dangerous, this a theoretical question), would the laptop charge the battery?
Or put another way. If the battery BMS, through communications, tells the laptop that it is locked, would the laptop enable voltage for charging?Comment
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Re: Laptop battery charging circuit
OK.
It's just that I was thinking what would happen if you had a battery with a locked BMS or with a blown fuse, and, instead of bridging it, you put a regular 4S BMS (without comms) in parallel with the original. So the laptop communicates status with the original BMS while receiving power through the parallel BMS. But I understand that most, if not all, will refuse to enable charging.Comment
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Re: Laptop battery charging circuit
How is this charging process related to EC / KBC? I think they keep communicating so they can charge. for example on the SMB0_DAT & SMB0_CLK pins in the battery socket, where these pins are connected directly to the KBC. There are times when the pin drops because of the KBC so the charging process doesn't occur, there are also times when you need to flash the KBC or replace the KBC so that the charging process occurs.Comment
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What is the solution if the voltage on the + battery pin is 19volts, but the battery is not installed?
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This will probably be that the high side battery charge MOSFET is defective. The high side and low side mosfets switch on/off to lower the main power rail voltage to charge the battery. Remove all power. Meter in resistance mode. Test the resistance across the MOSFET pins:
Source / drain
Source / gate
Gate / drain
Each resistance must be hundreds of k ohms or higher else the mosfet is defective.Comment
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Thank youComment
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Voltages measured on a working notebook may be helpful.Attached FilesI'm not happy to be so strong. because it's not humanlyComment
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Thank you so much for this great post, i'm starting to love this forumComment
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My question pertains to understanding the control circuity inside a Dell PT434 type battery used in Dell E6400, E6410 and other Dell notebooks?
Does anyone have a circuit diagram for the inside of a Dell PT434 battery and/or a description of how the control lines work to control this battery?
My reason for asking is I have a battery which I cannot get to charge beyond 1% in a Dell E6410 or E6400.
The LED bar graph charge indicator on the battery shows one LED lighted when the info button is pressed.
I have tried multiple different Dell power adapters. My Dell... -
ISL6257HRZ ISL6257HRZ-T Laptop Battery Charger Datasheet
Highly Integrated Narrow VDC Battery Charger for Notebook Computers
The ISL6257HRZ ISL6257HRZ-T is a highly integrated battery charger controller
for Li-Ion/Li-Ion polymer batteries. ISL6257 is designed for
Narrow VDC applications where the system power source is
either the battery pack or the regulated output of the charger.
This makes the max voltage to the system equal to the max
battery voltage instead of the max adapter voltage. Operating
at lower system voltage can improve...11-05-2024, 04:43 PM -
The MT3608 is a constant frequency, 6-pin SOT23 current mode step-up converter intended for small, low power applications. The MT3608 switches at 1.2MHz and allows the use of tiny, low cost capacitors and inductors 2mm or less in height.
Internal soft-start results in small inrush current and extends battery life.
The MT3608 features automatic shifting to pulse frequency modulation mode at light loads. The MT3608 includes under-voltage lockout, current limiting, and thermal overload protection to prevent damage in the event of an output overload. The MT3608 is available...10-07-2024, 05:02 AM -
Hello, guys!
Got this 8-pin MOSFET (I presume) on the motherboard that I'm still trying to repair (HP Stream 11-ah117wm DAY0HGMB6C1 REV:C), close to the DC IN connector, and when I read voltage on Drain (5-8 pins) and Source (1-3 pins), I got the 19.81 VDC of the DC IN on each, but on the Gate (pin 4) it's 25 VDC. Is it normal? Now, I'm not quite sure the component is a MOSFET, but it looks like, and since it has the printed code on it totally unreadable, I can't try to find the datasheet. Can anyone give me a hand on this? Or maybe ff there's some MOSFET tutorial or something that you can... -
UPS turned off one night and it seemed that the 3 year old batteries gave out.
Replaced with a new pair, but the UPS software claimed the battery voltage was only 18 volts and needed to charge. After 24 hours, the UPS claimed only 60% charge and 20 volts (although FWIW, my meter sees 27v).
...then I found various Cyberpower threads here with some guidance on what to check.
C1 (22uF) tested at 2, so I replaced that.
Put it all back together and didn't see a change on the reported battery voltage. Although, I did run the quick battery diagnostic...
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